今天用mm.mysql-2.0.4-bin.jar連接MySQL，報錯如下：
Communication failure during handshake. Is there a server running on localhost:3306?
我的MySQL數據庫的版本：5.0.18。使用mm.mysql-2.0.4-bin.jar，。出現了上面的問題。mysql服務是開的，有可能是驅動不行了，上mysql下載了個對應5.0的版本：MySQL-connector-Java-5.0.8-bin.jar ，再連接，ok，沒有出錯。
drivers=org.gjt.mm.mysql.Driver poolapp.url=jdbc:MySQL://localhost/test?user=root&passWord=ffcsoss&useUnicode=true&characterEncoding=8859_1
ysql網站上的說明：
MySQL Connector/J is a JDBC Type 4 driver. Different versions are available that are compatible with the JDBC-3.0 and JDBC-4.0 specifications. The Type 4 designation means that the driver is pure-Java implementation of the MySQL protocol and does not rely on the MySQL client librarIEs.
